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Significant Accounting Policies - Intangible assets (Details)
12 Months Ended
Dec. 31, 2020
Customer relationships  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life 3 years
Trade names  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life 10 years
Technologies  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life 7 years